In this classic Physical Science Study Committee (PSSC) film, MIT professor John G. King discusses the concept of time and shows various devices used to measure and record time intervals from 1 second down to 10 seconds. He points out that the accuracy of a clock can be judged only by comparison with another clock. The question of what time is, psychologically and physically, is raised briefly as well as the question of a possible limit to the subdivision of time. The film features noted stop-motion photographer Dr. Harold "Doc" Edgerton. Cinematography by Bert Van Bork. For more on PSSC films, visit http://www.afana.org/psscfilms.htm

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